CN101738831A - Method and apparatus for calibrating a color temperature of a projector - Google Patents
Method and apparatus for calibrating a color temperature of a projector Download PDFInfo
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- CN101738831A CN101738831A CN200910226566A CN200910226566A CN101738831A CN 101738831 A CN101738831 A CN 101738831A CN 200910226566 A CN200910226566 A CN 200910226566A CN 200910226566 A CN200910226566 A CN 200910226566A CN 101738831 A CN101738831 A CN 101738831A
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- value
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- projector
- color light
- primitive color
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/73—Colour balance circuits, e.g. white balance circuits or colour temperature control
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3191—Testing thereof
- H04N9/3194—Testing thereof including sensor feedback
Abstract
A method and apparatus for calibrating a color temperature of a projector that creates a light of a desired color by mixing primary lights. The method includes setting target values for the mixed light, measuring color coordinate values for the primary lights, calculating the target brightness values for the primary lights using the target values and the measured color coordinate values, and calibrating the output of the primary lights output from the projector based on the calculated target brightness values.
Description
Technical field
The present invention relates generally to comprise the projector of the primary lights such as light emitting diode (LED), more specifically, relate to the method and apparatus of the colour temperature (color temperature) that is used for calibrated projector.
Background technology
In general, the RGB light emitting diode produces ruddiness, green glow and blue light respectively, also is primary colors, and the projector that comprises the RGB light emitting diode is by mixing primitive color light come the light of startup stage observation of complexion.The colour temperature of coming measuring projector at light (normally white light) from the benchmark color of projector output.According to the brightness value and the wavelength of primary lights, at the colour temperature variation of the generating white light based target colour temperature of exporting from projector.Colour temperature changes the influence that couples mistake or loss that is produced in the process that is subjected to primary lights, camera lens and beam splitter (beamsplitter) in projector is installed.
Fig. 1 and Fig. 2 are the figure that illustrates color temperature distribution.Distribution among Fig. 1 is caused by the brightness of primary lights and wavelength variations.Distribution among Fig. 2 be by produced in primary lights, camera lens and the beam splitter process in projector is installed couple mistake or loss is caused.
The range of luminance values of red light emitting diodes is to 24.5 lumens from 19.0 lumens (lm), and its wavelength coverage is to 620 nanometers from 615 nanometers (nm), the range of luminance values of green LED is to 70.0 lumens from 54.0 lumens, and its wavelength coverage is to 535 nanometers from 525 nanometers, and the range of luminance values of blue LED be from 11.0 lumens to 14.5 lumens, and its wavelength coverage is to 465 nanometers from 455 nanometers.
Fig. 1 and Fig. 2 show the part of CIE 1931 color spaces and Planckian locus (Planckian locus).In the figure of Fig. 1 and Fig. 2, the x axle is represented the x chromatic value, and the y axle is represented the y chromatic value.As shown in following equation (1), x and y express with the function of tristimulus values X, Y and Z, and wherein Y is corresponding to the brightness value of light.
Fig. 1 and Fig. 2 drawn correlated colour temperature (CCT:Correlated Color Temperature), as the CCT of target CCT
MIX, D65,6500K and D93,9300K.In Fig. 1, CCT is distributed in the scope of 6457K to 18682K.In Fig. 2, CCT is distributed in the scope of 6669K to 9504K.
If because 1) brightness and the wavelength variations or 2 of primary lights) produce in the primary lights, camera lens, beam splitter process in projector is installed couple mistake or loss, and cause the observer can visually discern the distribution of colour temperature, then need the colour temperature of calibrated projector.But present, colour temperature is difficult for calibration.
Summary of the invention
Make the present invention solving the problems referred to above that occur in the prior art, and the invention provides a kind of method of colour temperature of easy and automatic calibrated projector.
According to one aspect of the present invention, a kind of method of colour temperature of calibrated projector is provided, this projector is the light of startup stage observation of complexion by mixing primitive color light.This method comprises: the desired value that mixed light is set; Measure the color coordinates value of former light; Use described desired value and measured color coordinates value to calculate the target brightness value of primitive color light; And calibrate from the output of the primitive color light of projector output based on the target brightness value that calculates.
Above-mentioned and other feature, aspect and advantage of the present invention will become clearer from the detailed description below in conjunction with accompanying drawing.
Description of drawings
Above-mentioned and other aspect of the present invention, feature and advantage will become clearer from the detailed description below in conjunction with accompanying drawing, in the accompanying drawing:
Fig. 1 shows the figure of the distribution of the colour temperature that is caused by the brightness of primary lights and wavelength variations;
Fig. 2 shows the figure of the distribution that couples mistake or the colour temperature that loss caused that produces in the process by primary lights, camera lens and beam splitter in projector is installed;
Fig. 3 is according to an embodiment of the invention, is used for the synoptic diagram of equipment of the colour temperature of calibrated projector; And
Fig. 4 be according to an embodiment of the invention, the process flow diagram of the method for the colour temperature of calibrated projector.
Embodiment
Hereinafter, specific embodiments of the invention are described with reference to the accompanying drawings.Below in the description of this invention, in the time may bluring theme of the present invention, it is omitted the detailed description of the known function of incorporating this instructions into and structure.
Fig. 3 is the synoptic diagram of colour temperature correcting device according to an embodiment of the invention.
With reference to Fig. 3, colour temperature correcting device 200 comprises projector driver 220, temperature controlled stage 230, temperature controller 240, power supply 250, colorimeter (colorimeter) 260 and master controller 270.In addition, projector 210 is installed in the top of temperature controlled stage 230, and temperature controlled stage 230 calibrates or keep consistently the temperature of projector 210 according to the input temp control signal.Temperature controller 240 generates temperature control signals according to the temperature that the user is provided with, and this temperature control signals is outputed to temperature controlled stage 230.
Though the colour temperature correcting device that illustrates in Fig. 3 has comprised independent temperature controller 240, the function of temperature controller 240 can be carried out by master controller 270.
Though projector driver 220 is provided as separating with projector 210 in Fig. 3, it also can be embedded in the projector 210.
To from mathematics colour temperature calibration algorithm according to an embodiment of the invention be described below.
Equation (2) with reference to following obtains the tristimulus values of mixed light by excitation value (stimulus value) addition with primitive color light:
X
R+X
G+X
B＝X
m
Y
R+Y
G+Y
B＝Y
m
Z
R+Z
G+Z
B＝Z
m ....(2)
x
m, y
mAnd z
mCorresponding to the color value of mixed light, and Y
mBrightness value corresponding to mixed light.As following equation (3) is expressed, use Y
m, x
m, y
mAnd z
mFunction express excitation value X
mAnd Z
m
.....(3)
As following equation (4) and (5) are expressed, can be according to the color value x of rgb light
i, y
iAnd z
i, mixed light color value x
m, y
mAnd z
mAnd the brightness value Y of mixed light
mCalculate the brightness value Y of rgb light
iHere, i represents among R, G or the B one.
Fig. 4 is the process flow diagram of method that illustrates according to an embodiment of the invention, is used for the colour temperature of calibrated projector.
With reference to Fig. 4, this method comprises: the desired value that mixed light is set at step S110, measure primitive color light at step S120, calculate the desired value of primitive color light at step S130, the brightness value that compares first primitive color light at step S140, calibrate the input current of first primary lights at step S150, the brightness value that compares second primitive color light at step S160, calibrate the input current of second primary lights at step S170, the brightness value that compares primaries at step S180, calibrate the input current of three primary colors light source at step S190, the target power consumption of primary lights is set at step S200, in the power consumption of step S210 measurement primary lights, and the input current value of calculating primary lights at step S220.
More specifically, at step S110, import the color of object coordinate (x of white light by the user
m, y
m) or (CCT
m, Δ uv
m) and target brightness value Y
mΔ uv
mBe illustrated in target correlated colour temperature CCT in CIE 1931 color spaces
mAnd the distance between the Planckian locus.
At step S120, measure the color coordinates value and the brightness value of ruddiness, green glow and blue light respectively.The input current value DAC that is set as default value according to red light source, green light source and blue-light source
RO, DAC
GOAnd DAC
BO, master controller 270 will represent that the primary signal of giving tacit consent to current value outputs to projector driver 220 in order.Projector driver 220 offers projector 210 with the input current of primary lights accordingly with this primary signal.Rgb light is created and exported to projector 210 in order by being input to the rgb light source from the electric current that projector driver 220 provides.That is to say that projector 210 drives (perhaps, opening or closing in order) rgb light source in order.Colorimeter 260 detects ruddiness, green glow and the blue light of introducing in order from projector 210 respectively, to measure color coordinates value (x
i, y
i) and brightness value Φ
IoColorimeter 260 outputs to master controller 270 with measured value.
At step S130, calculate the target brightness value Y of rgb light
iFor example, master controller 270 is by the desired value x with user's input
m, y
mAnd Y
mAnd the equation (5) above the measured value that colorimeter 260 is imported is applied to calculates target brightness value Y
i
At step S140, with the target brightness value Y that calculates
RWith the brightness value Φ that measures
RMutually relatively.Afterwards, if fiducial value (also being difference) is equal to or less than permissible value, then master controller 270 is at the brightness value of step S160 comparison second primitive color light, if perhaps fiducial value is greater than permissible value, then master controller 270 is calibrated the input current of first primary lights at step S150.
According to embodiments of the invention, the permission difference of each primitive color light is set as zero.Therefore, master controller 270 is determined the target brightness value Y that calculates
RWith the brightness value Φ that measures
RWhether identical.
At step S150, the output of calibration red light source is so that the fiducial value of ruddiness satisfies permissible value.More specifically, the current offset values positive or that bear that master controller 270 will be corresponding with fiducial value is added to previous acquiescence current value DAC
RO, to calculate new input current value DAC
R, and will represent DAC
RDanger signal output to projector driver 220.The danger signal that projector 210 provides based on projector driver 220 and input current are to red-light source, to create and output ruddiness.Colorimeter 260 detects the ruddiness of introducing from projector 210, and measures the brightness value Φ of this ruddiness
R, with the brightness value Φ that will measure
ROutput to master controller 270.
Though in Fig. 4, repeat the step of the input current of the step of brightness value of described primaries light and described calibration primitive color light, up to satisfying particular requirement, but replacedly, each step can only be carried out once, and can be added to and calculate new input current value on the previous current value by presetting increment or decrement when the input current of calibration primary lights.
At step S160, with the target brightness value Y that calculates
GWith the brightness value Φ that measures
GMutually relatively.Afterwards, if fiducial value is equal to or less than permissible value, then master controller 270 is at the brightness value of step S 180 comparison primaries, if perhaps fiducial value is greater than permissible value, then master controller 270 is calibrated the input current of second primary lights at step S170.As mentioned above, because allow difference to be set as zero here, so master controller 270 is determined the target brightness value Y that calculates
GWith the brightness value Φ that measures
GWhether identical.
At step S170, the output of calibration green-light source is so that the fiducial value of green glow satisfies permissible value.More specifically, the current offset values positive or that bear that master controller 270 will be corresponding with fiducial value is added to previous acquiescence current value DAC
GO, to calculate new input current value DAC
G, and will represent DAC
GGreen output to projector driver 220.Projector 210 based on the green input current that provides from projector driver 220 to green-light source, to create and the output green glow.Colorimeter 260 detects the green glow of introducing from projector 210, and measures the brightness value Φ of this green glow
G, with the brightness value Φ that will measure
GOutput to master controller 270.
At step S180, with the target brightness value Y that calculates
BWith the brightness value Φ that measures
BMutually relatively.After comparison step, if fiducial value is equal to or less than permissible value, then master controller 270 is provided with the target power consumption of primary lights at step S200, if perhaps fiducial value is greater than permissible value, then master controller 270 is calibrated the input current of three primary colors light source at step S190.As mentioned above, because allow difference to be set as zero here, so master controller 270 is determined the target brightness value Y that calculates
BWith the brightness value Φ that measures
BWhether identical.
At step S190, the output of calibration blue light source is so that the fiducial value of blue light satisfies permissible value.More specifically, the current offset values positive or that bear that master controller 270 will be corresponding with fiducial value is added to previous acquiescence current value DAC
BO, to calculate new input current value DAC
B, and will represent DAC
BBlue signal output to projector driver 220.Projector 210 based on the blue signal input current that provides from projector driver 220 to blue light source, to create and the output blue light.Colorimeter 260 detects the blue light of introducing from projector 210, and measures the brightness value Φ of this blue light
B, with the brightness value Φ that will measure
BOutput to master controller 270.
Method shown in replaceable Fig. 4 be that relatively the brightness value of blue light can replace with such step: by adjusting expression DAC
BThe blue signal CCT value (perhaps brightness value) of coming the comparison white light.That is to say that relatively the final step of blue light brightness value is in fact corresponding to comparison object correlated colour temperature CCT
mStep with the CCT value of the white light that measures.
In addition, the particular order of the input current of the brightness value of primaries light and calibration primary lights can be carried out to be different from the order that specifically illustrates among Fig. 4.
After the colour temperature of white light being calibrated to expectation value, the total power consumption in the rgb light source of white light can be restricted to predetermined value by step S110-S180.The output of the ratio of the power consumption that measures being calibrated primary lights by the based target power consumption realizes this restriction.
When step S200 was provided with the target power consumption of primary lights, master controller 270 received the target power consumption number in the rgb light source of white light from the user.As shown in following equation (6), express target power consumption number W
0:
W
0＝∑V
i0·I
i0·D
i ...(6)
In equation (6), V
I0.I
I0Be expressed as the target power input value that corresponding primary lights provides, be about to also that voltage multiply by electric current and the value that obtains, and D
iThe dutycycle of representing corresponding primary lights.The dutycycle of primary lights represents to drive in the one-period time ratio of primary lights.That is to say, recently open or close primary lights according to this duty.
At step S210, measure the total power consumption value W in the rgb light source be used to create white light
mProjector driver 220 is with the total power consumption value W that measures
mOutput to master controller 270.
By power consumption difference Δ W is added to target power consumption number W
0And obtain total power consumption value W
m, and shown in following equation (7), express total power consumption value W
m
W
m＝W
0+ΔW＝∑V
i·I(DAC
i)·D
i ....(7)
In equation (7), V
iI (DAC
i) be the value that is measured with the power of creating white light by to the primary lights that is input to correspondence in the one-period.
At step S220, master controller 270 calculates the current value that is input to the rgb light source.By following equation (8) calculate current value I (DAC '
i), this current value I (DAC '
i) be calibrated to be input to the rgb light source to create white light.
Current value I after afterwards, master controller 270 will be represented to calibrate (DAC '
i) rgb signal output to projector controller 220, the total power consumption in the rgb light source of white light is restricted to target power consumption number W
0
Method in the colour temperature that is used for calibrated projector according to an embodiment of the invention, calibrate the brightness value of primitive color light based on the value of the desired value of the set mixed light of user and the primitive color light that measures, thus the colour temperature of calibrated projector easily and automatically.
According to this method, can come the colour temperature of calibrated projector in the 100K scope at-100K with respect to the target colour temperature.
In addition, because can by the calibration primary lights input current calibrate primitive color light brightness value and can be by input current being reduced the total power consumption that estimated rate easily limits primary lights, so can prevent the overheated of projector.
In addition, should it is evident that, can realize the method that is used for the colour temperature of calibrated projector according to of the present invention with the form of hardware, software or their combination.For example, program can be stored in the volatibility recording medium or nonvolatile recording medium that can be read by the machine such as computing machine.Recording medium can comprise storer such as ROM, the storer such as RAM etc., storage chip, integrated circuit etc. and such as the optical recording media or the magnetic recording media of CD, DVD, disk, tape etc.That is to say, can realize being used for the method for the colour temperature of calibrated projector with the form of the program that comprises code.And, can transmit such program and such program by the incoming call of the arbitrary medium such as the wired or wireless communication signal, comprise its equivalent.
Although illustrate and described the present invention with reference to specific embodiment of the present invention, but those skilled in the art is to be understood that, not breaking away under the condition of the spirit and scope of the present invention as defined by the appended claims, can carry out the various variations on form and the details here.
Claims (11)
1. the method for the colour temperature of a calibrated projector, this projector is by mixing the light that primitive color light comes the startup stage observation of complexion, and this method comprises:
The desired value of mixed light is set;
Measure the color coordinates value of primitive color light;
The color coordinates value of using described desired value and measuring is calculated the target brightness value of primitive color light; And
Calibrate from the output of the primitive color light of projector output based on the target brightness value that calculates.
2. method according to claim 1, wherein, the described step that desired value is set comprises color of object coordinate figure and the target brightness value of being imported mixed light by the user.
3. method according to claim 1 and 2, wherein, described primitive color light comprises ruddiness, green glow and blue light.
4. according to the described method of each claim in the aforementioned claim, wherein, the step of the output of described calibration primitive color light comprises:
The brightness value of the primary colors that measures and the target brightness value of primary colors are compared; And
The output of calibration primitive color light is so that fiducial value is no more than predetermined permissible value.
5. method according to claim 4, wherein, described projector comprises a plurality of primary lights that are used to create primitive color light, and the step of the output of described calibration primitive color light comprises that calibration is used to export the input current of the light source of primitive color light.
6. according to the described method of each claim in the claim 1 to 3, wherein, the step of the output of described calibration primitive color light comprises:
The brightness value that will measure for one of primitive color light compares with corresponding target brightness value;
The brightness value that will measure for mixed light compares with corresponding target brightness value; And
The output of calibration primitive color light is so that fiducial value is no more than predetermined permissible value.
7. according to the described method of each claim in the claim 1 to 3, wherein, the step of the output of described calibration primitive color light comprises:
The brightness value that will measure for ruddiness and green glow compares with corresponding target brightness value;
The output of calibration ruddiness and green glow is so that the fiducial value of ruddiness and green glow is no more than predetermined permissible value;
The correlated colour temperature that will measure for white light compares with corresponding target correlated colour temperature; And
The output of calibration blue light is so that the fiducial value of white light is no more than predetermined permissible value.
8. according to the described method of each claim in the aforementioned claim, wherein, described projector comprises a plurality of primary lights that are used to create primitive color light, and described method also comprises:
The target power consumption number of all primary lights is set;
Measure the power consumption number of all primary lights; And
The output that the based target power consumption number is calibrated primary lights to the ratio of the power consumption number that measures.
9. a computer-readable medium is used to carry out the method according to the colour temperature that is used for calibrated projector of arbitrary aforementioned claim.
10. the color of the equipment (200) of the colour temperature of a calibrated projector (210), this projector primitive color light by mixing primary lights is come the light of startup stage observation of complexion, and this equipment (200) comprising:
Colorimeter (260) is used to measure the color coordinates value of every kind of primitive color light;
Master controller (270), be used to receive the desired value of mixed light, the color coordinates value of using desired value and measuring is calculated the target brightness value of every kind of primitive color light, and calibrates from the output of the primitive color light of projector (210) output based on the target brightness value that calculates.
11. equipment according to claim 10, wherein, described primitive color light comprises:
Ruddiness;
Green glow; With
Blue light.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020080117402A KR101597822B1 (en) | 2008-11-25 | 2008-11-25 | Method for calibrating a color temperature of a projector |
| KR117402/08 | 2008-11-25 |
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| Publication Number | Publication Date |
|---|---|
| CN101738831A true CN101738831A (en) | 2010-06-16 |
| CN101738831B CN101738831B (en) | 2014-12-10 |
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| CN200910226566.5A Expired - Fee Related CN101738831B (en) | 2008-11-25 | 2009-11-25 | Method and apparatus for calibrating a color temperature of a projector |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US8382287B2 (en) |
| EP (1) | EP2189841B1 (en) |
| KR (1) | KR101597822B1 (en) |
| CN (1) | CN101738831B (en) |
| AT (1) | ATE556353T1 (en) |
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| KR101385453B1 (en) * | 2007-05-02 | 2014-04-21 | 삼성디스플레이 주식회사 | Driving method of light source and back light assembly for carrying out the driving method |
| US7948499B2 (en) * | 2007-07-12 | 2011-05-24 | Texas Instruments Incorporated | Color control algorithm for use in display systems |
-
2008
- 2008-11-25 KR KR1020080117402A patent/KR101597822B1/en active IP Right Grant
-
2009
- 2009-09-10 EP EP09169884A patent/EP2189841B1/en not_active Not-in-force
- 2009-09-10 AT AT09169884T patent/ATE556353T1/en active
- 2009-09-10 US US12/557,079 patent/US8382287B2/en not_active Expired - Fee Related
- 2009-11-25 CN CN200910226566.5A patent/CN101738831B/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105227942A (en) * | 2015-08-27 | 2016-01-06 | 广东威创视讯科技股份有限公司 | A kind of projector's colour temperature method to set up and colour temperature arrange system |
| CN105227942B (en) * | 2015-08-27 | 2018-09-25 | 广东威创视讯科技股份有限公司 | System is arranged in a kind of projector's colour temperature setting method and colour temperature |
| CN105578166A (en) * | 2016-01-08 | 2016-05-11 | 浙江宇视科技有限公司 | Color temperature determination method and device |
| CN105578166B (en) * | 2016-01-08 | 2018-06-05 | 浙江宇视科技有限公司 | A kind of colour temperature determines method and device |
| CN114174918A (en) * | 2019-05-31 | 2022-03-11 | 巴科股份有限公司 | Color point calibration method and system for light source projector |
| CN114174918B (en) * | 2019-05-31 | 2024-03-22 | 巴科股份有限公司 | Color point calibration method and system for light source projector |
| CN111458967A (en) * | 2020-04-17 | 2020-07-28 | 歌尔微电子有限公司 | Color and color temperature calibration method, calibration device and projection display equipment |
| CN111458967B (en) * | 2020-04-17 | 2022-05-24 | 歌尔微电子有限公司 | Color and color temperature calibration method, calibration device and projection display equipment |
| WO2022174651A1 (en) * | 2021-02-22 | 2022-08-25 | 深圳市火乐科技发展有限公司 | Projection device control method and apparatus, medium, and electronic device |
Also Published As
| Publication number | Publication date |
|---|---|
| US20100128052A1 (en) | 2010-05-27 |
| KR101597822B1 (en) | 2016-02-25 |
| US8382287B2 (en) | 2013-02-26 |
| ATE556353T1 (en) | 2012-05-15 |
| EP2189841B1 (en) | 2012-05-02 |
| KR20100058842A (en) | 2010-06-04 |
| CN101738831B (en) | 2014-12-10 |
| EP2189841A1 (en) | 2010-05-26 |
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